I couldn't finish 'em. Looks like this's gonna get complicated.
The Proto Beam Cannon is an enemy in Final Fantasy IV: The After Years. It is of no threat to the party, although it will constantly attack using the Beam ability for minor to moderate non-elemental damage to a single party member. Lightning-elemental attacks may force the enemy to attack itself and its own allies.
Proto- is a Greek prefix that means "first."